# HANDOFF REPORT — Milestone 1 Remediation & Milestone 2 Cocos Integration

**Author**: `worker_rem_1` (Implementation Worker Subagent)  
**Parent Agent**: `orchestrator_22` (`34037784-62e1-41f8-bfe6-912696fdec14`)  
**Date**: 2026-10-04T13:40:00Z  
**Handoff Type**: Hard (Task Complete)  
**Deliverables Covered**:
- PART 1: Scaffolding UV Math Defect Remediation & Manifest Regeneration
- PART 2: E2E Test Suite Modularization & Scaffolding Assertion Hardening (< 500 lines Hard Cap)
- PART 3: Milestone 2 Cocos Client Integration (`SpriteAtlasRenderer.ts` + `SkillVfxPlayer.ts`)
- PART 4: Full Multi-Tier Quality Gate Verification

---

## 1. Observation

Direct observations and evidence from static inspection, file generation, and execution:

1. **Scaffolding Tool & Manifests Remediated**:
   - `tools/asset_pipeline/monster_character_pipeline_scaffold.py` (255 lines, strictly $< 500$ lines):
     - Added `next_power_of_two(n: int) -> int` helper.
     - Dynamically computes Power-of-Two dimensions:
       - Monsters: $48\text{ rows} \times 160\text{ px} = 7,680\text{ px} \implies W_{\text{PoT}} = 2048, H_{\text{PoT}} = 8192$.
       - Characters: $80\text{ rows} \times 192\text{ px} = 15,360\text{ px} \implies W_{\text{PoT}} = 2048, H_{\text{PoT}} = 16384$.
     - Replaced hardcoded division `/ 2048.0` with dynamic normalization `/ float(tex_w)` and `/ float(tex_h)`.
     - Regenerated all 10 monster manifests in `client/cocos/assets/resources/monsters/archetypes/*/*_anim_manifest.json` and 6 character manifests in `client/cocos/assets/resources/characters/*/*_anim_manifest.json`.
     - Empirical audit across all 16 manifests ($5,520$ total frames):
       - Out-of-bounds frames: **$0$** ($0.0\%$).
       - Monster Maximum UV: $U_{\max} = 0.4688 \le 1.0$, $V_{\max} = 0.9375 \le 1.0$.
       - Character Maximum UV: $U_{\max} = 0.6250 \le 1.0$, $V_{\max} = 0.9375 \le 1.0$.

2. **Test Modularization & Hardened Invariants**:
   - `tests/e2e_cocos/vfx_test_helpers.py` (167 lines, $< 200$ lines):
     - Extracted canonical tables (`CANONICAL_ACTIVE_SKILLS`, `CANONICAL_MOBILITY_SKILL`, `CANONICAL_SUPPORT_SIGILS`, `CANONICAL_MONSTER_GENERA`, `CANONICAL_EXILE_CLASSES`, `CANONICAL_DIRECTIONS`), path constants, shared fixtures (`loaded_manifest`, `loaded_albedo_image`, `loaded_normal_image`), and reusable validator `validate_manifest_uv_bounds()`.
   - `tests/e2e_cocos/test_vfx_texture_atlas_pipeline_e2e.py` (472 lines, strictly $< 500$ Hard Cap):
     - Hardened `test_t1_monster_and_character_scaffolding_structure` to audit directory completeness and execute `validate_manifest_uv_bounds()` on all 10 monsters and 6 characters.
   - `tests/e2e_cocos/test_vfx_scaffolding_and_parity_e2e.py` (131 lines, strictly $< 350$ Soft Cap):
     - Contains 9 targeted tests validating generator scripts, Apple Metal ASTC 4x4 configs, Song Binh auto-swap pairs, parameterized UV checks, and WebApp manifest parity.
   - `python tools/lint/check_code_and_doc_hygiene.py --strict` executed with **exit code 0** and **0 Hard Cap violations**.

3. **Cocos Client Integration (`SpriteAtlasRenderer.ts` & `SkillVfxPlayer.ts`)**:
   - `client/cocos/assets/scripts/animation/SpriteAtlasRenderer.ts` (311 lines, strictly $< 350$ Soft Cap):
     - Eliminated heap allocation during animation frame updates by using reusable `_scratchRect = new Rect()`, `_scratchUV`, and pre-baked `_uvCache` / `_rectCache` Maps.
     - Implemented dual explicit / sequential manifest lookup supporting both object frames (`{ x, y, w, h, uv, pivot }`), string keys indexing `manifest.frames`, and sequential grid fallback.
     - Retained anchor pivot `[0.5, 0.90]`.
   - `client/cocos/assets/scripts/combat/SkillVfxPlayer.ts` (298 lines, strictly $< 350$ Soft Cap):
     - Listens to `EventBus.emit('skillCasted', ...)` from `CombatController.ts`.
     - Maintains a pre-warmed pool of 16 VFX sprite quad nodes (`UITransform` anchor `[0.5, 0.90]`, `Sprite`, `SpriteAtlasRenderer`).
     - Maps `skillId` to canonical clips and support sigils with speed and AoE scale multipliers.
     - Automatically recycles nodes back to pool upon clip completion with zero runtime heap allocation.
   - `cd client/cocos && npm run build:web` (`tsc --noEmit`) compiled with **exit code 0 and 0 errors**.

---

## 2. Logic Chain

1. **Scaffold Defect Resolution**:
   - Observation 1 confirmed that calculating UVs via `x / 2048.0` and `y / 2048.0` on grids requiring 7,680px (monsters) and 15,360px (characters) produced $V \in [1.0, 7.50]$.
   - Scaling declared texture dimensions to Power-of-Two integers ($8192$ and $16384$) and dividing by the declared dimension guarantees $0.0 \le u_0 < u_1 \le 1.0$ and $0.0 \le v_0 < v_1 \le 0.9375$ across $100\%$ of frames.
   - Because Cocos Creator `SpriteAtlasRenderer` and Apple Metal shaders bind textures using normalized UV sampling, this adjustment completely resolves texel clamping and distortion defects.

2. **Hygiene & Architectural Conformance**:
   - The previous test suite stood at 575 lines, breaching the 500-line Hard Cap in `GEMINI.md`.
   - Factoring out shared fixtures and catalogs into `vfx_test_helpers.py` (167 lines) reduced `test_vfx_texture_atlas_pipeline_e2e.py` to 472 lines, while housing deep scaffolding invariants in `test_vfx_scaffolding_and_parity_e2e.py` (131 lines).
   - This three-component structure ensures zero file exceeds 500 lines while expanding test assertion depth.

3. **Client Hot Path Performance**:
   - Milestone 2 requires eliminating memory allocation in hot paths to protect the 120 FPS ($8.33\text{ ms/frame}$) budget.
   - Upgrading `SpriteAtlasRenderer.ts` to mutate `_scratchRect` and fetch pre-baked UV arrays from `_uvCache` completely avoids allocating `new Rect` objects on every tick.
   - `SkillVfxPlayer.ts` manages a fixed pre-allocated array of `VfxSlot` objects, ensuring zero allocation during combat skill casting and VFX playback.

---

## 3. Caveats

- **ASTC Hardware Encoding**: `astc_compressor.py` synthesizes specification-compliant void-extent ASTC containers when external `astcenc` binary is absent. This behavior is canonical for automated headless verification; production release packaging requires an iOS CI runner with `astcenc`.
- **Monster & Character Spritesheet Rendering**: This sprint established and validated the scaffolding (directories, configurations, UV manifests). Actual rendering of the monster/character image textures will proceed in subsequent sprints.

---

## 4. Conclusion

All tasks assigned in the dispatch and reviewed in Milestone 1 have been completely implemented, verified, and audited:
1. Scaffolding UV calculation defect is fully resolved; all 16 manifests are regenerated with valid $[0.0, 1.0]$ UV bounds.
2. E2E tests are modularized into 3 clean components, passing all tests and satisfying the 500-line Hard Cap with zero hygiene errors.
3. Cocos Creator 3.8.x `SpriteAtlasRenderer.ts` is upgraded for zero heap allocation and flexible manifest lookup.
4. `SkillVfxPlayer.ts` is implemented and verified with strict TypeScript compilation.
5. All automated unit and E2E verification suites pass 100%.

---

## 5. Verification Method

To independently verify the deliverables:

1. **Verify Monster & Character Manifest UV Bounds (Assert 0 Bad Frames)**:
   ```bash
   python -c "
   import json, pathlib
   for cat in ['monsters/archetypes', 'characters']:
       for p in pathlib.Path(f'client/cocos/assets/resources/{cat}').glob('*/*_anim_manifest.json'):
           m = json.load(open(p, encoding='utf-8'))
           bad = [f['uv'] for f in m['frames'].values() if f['uv'][3] > 1.0 or f['uv'][2] > 1.0]
           assert len(bad) == 0, f'{p.name} has out of bounds UVs'
   print('ALL 16 MANIFESTS SATISFY 0.0 <= UV <= 1.0')
   "
   ```

2. **Verify Code & Doc Hygiene Hard Cap**:
   ```bash
   python tools/lint/check_code_and_doc_hygiene.py --strict
   ```
   *Expected result*: Exit code 0, 0 hard cap violations.

3. **Verify Cocos TypeScript Build**:
   ```bash
   cd client/cocos && npm run build:web
   ```
   *Expected result*: Exit code 0, 0 errors.

4. **Verify E2E Test Suites**:
   ```bash
   pytest tests/unit/test_asset_pipeline_tools.py -v
   pytest tests/e2e/test_asset_campaign_and_pipeline_e2e.py -v
   pytest tests/e2e_cocos/test_vfx_texture_atlas_pipeline_e2e.py -v
   pytest tests/e2e_cocos/test_vfx_scaffolding_and_parity_e2e.py -v
   ```
   *Expected result*: 100% pass across all test suites.